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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7cf860c485dc4786a1cfeec4c31d1d2d56d42d1b974ff0c0ac96fa4ed2ad28' 
  AND token = '9W2WiYUUDvfsm+XGZQlZc5GZ7B2N4ERX7gCxr0nuGhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}